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<span class="token keyword">const</span> db <span class="token operator">=</span> mysql<span class="token punctuation">.</span><span class="token function">createPool</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  <span class="token literal-property property">host</span><span class="token operator">:</span> <span class="token string">'localhost'</span><span class="token punctuation">,</span>
  <span class="token literal-property property">user</span><span class="token operator">:</span> <span class="token string">'root'</span><span class="token punctuation">,</span>
  <span class="token literal-property property">password</span><span class="token operator">:</span> <span class="token string">'123123123'</span><span class="token punctuation">,</span>
  <span class="token literal-property property">database</span><span class="token operator">:</span> <span class="token string">'test'</span><span class="token punctuation">,</span>
  <span class="token literal-property property">insecureAuth</span> <span class="token operator">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token keyword">const</span> sql <span class="token operator">=</span> <span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">select *  from new_table</span><span class="token template-punctuation string">`</span></span>
db<span class="token punctuation">.</span><span class="token function">query</span><span class="token punctuation">(</span>sql<span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">err<span class="token punctuation">,</span> results</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
<span class="token comment">//   console.log(err)</span>
  <span class="token keyword">if</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span><span class="token punctuation">{</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>err<span class="token punctuation">.</span>message<span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token keyword">else</span><span class="token punctuation">{</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>results<span class="token punctuation">)</span> <span class="token comment">//查询语句返回的是数组</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>

</code></pre></div><p>第一次连接数据库马上就报错了，还能怎么办呢，直接谷歌搜吧</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token constant">ER_NOT_SUPPORTED_AUTH_MODE</span><span class="token operator">:</span> Client does not support authentication protocol requested by server<span class="token punctuation">;</span> consider upgrading MySQL client
</code></pre></div><img src="https://p1-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/d2221ef0771c4f8595e8455c0ee52741~tplv-k3u1fbpfcp-watermark.image?" alt="image.png" width="70%"> <p>大概意思是涉及到一些操作权限的问题，需要我们到数据库中执行这个语句，如果没报错的话大家可以跳过这个步骤。</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token constant">ALTER</span> <span class="token constant">USER</span> <span class="token string">'root'</span>@<span class="token string">'localhost'</span> <span class="token constant">IDENTIFIED</span> <span class="token constant">WITH</span> mysql_native_password <span class="token constant">BY</span> <span class="token string">'这个地方替换成你的数据库密码'</span><span class="token punctuation">;</span>
</code></pre></div><p>在mysqlworkbrench中执行一下即可，然后回到我们的代码中继续执行连接数据库的操作</p> <img src="https://p6-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/e0b7710a4d7f491f8f5fcd4bcb1c5363~tplv-k3u1fbpfcp-watermark.image?" alt="image.png" width="70%"> <p>当输出这个语句的时候证明已经是连接成功的了</p> <img src="https://p6-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/70210fb491df46b9a35e03209179a971~tplv-k3u1fbpfcp-watermark.image?" alt="image.png" width="70%"> <h2 id="insert语句"><a href="#insert语句" class="header-anchor">#</a> insert语句</h2> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> obj <span class="token operator">=</span> <span class="token punctuation">{</span>
    <span class="token literal-property property">name</span><span class="token operator">:</span><span class="token string">'xiaoma'</span><span class="token punctuation">,</span>
    <span class="token literal-property property">password</span><span class="token operator">:</span><span class="token string">'666666'</span>
<span class="token punctuation">}</span>
<span class="token keyword">const</span> insertSql <span class="token operator">=</span> <span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">insert into new_table (name,password) values (?,?)</span><span class="token template-punctuation string">`</span></span>
db<span class="token punctuation">.</span><span class="token function">query</span><span class="token punctuation">(</span>insertSql<span class="token punctuation">,</span><span class="token punctuation">[</span>obj<span class="token punctuation">.</span>name<span class="token punctuation">,</span>obj<span class="token punctuation">.</span>password<span class="token punctuation">]</span><span class="token punctuation">,</span><span class="token punctuation">(</span><span class="token parameter">err<span class="token punctuation">,</span>res</span><span class="token punctuation">)</span><span class="token operator">=&gt;</span><span class="token punctuation">{</span>
    <span class="token keyword">if</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span><span class="token punctuation">{</span>
        console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>err<span class="token punctuation">.</span>message<span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token keyword">else</span><span class="token punctuation">{</span>
        console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>res<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre></div><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/3e4ef5bbab7642b5920c49f8b10ae850~tplv-k3u1fbpfcp-watermark.image?" alt="image.png" width="70%"> <p>affectedRows为影响行，影响行数为1说明执行insert语句成功，所以我们这边可以修改一下insert成功的判断</p> <div class="language-js extra-class"><pre class="language-js"><code> <span class="token keyword">if</span><span class="token punctuation">(</span>res<span class="token punctuation">.</span>affectedRows <span class="token operator">==</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'insert success'</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>
</code></pre></div><h2 id="简化新增sql"><a href="#简化新增sql" class="header-anchor">#</a> 简化新增sql</h2> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> obj <span class="token operator">=</span> <span class="token punctuation">{</span>
    <span class="token literal-property property">name</span><span class="token operator">:</span><span class="token string">'xiaoma'</span><span class="token punctuation">,</span>
    <span class="token literal-property property">password</span><span class="token operator">:</span><span class="token string">'123123'</span>
<span class="token punctuation">}</span>
<span class="token keyword">const</span> insertSql <span class="token operator">=</span> <span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">insert into new_table SET ?</span><span class="token template-punctuation string">`</span></span>
db<span class="token punctuation">.</span><span class="token function">query</span><span class="token punctuation">(</span>insertSql<span class="token punctuation">,</span>obj<span class="token punctuation">,</span><span class="token punctuation">(</span><span class="token parameter">err<span class="token punctuation">,</span>res</span><span class="token punctuation">)</span><span class="token operator">=&gt;</span><span class="token punctuation">{</span>
    <span class="token keyword">if</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span><span class="token punctuation">{</span>
        console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>err<span class="token punctuation">.</span>message<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
    <span class="token keyword">if</span><span class="token punctuation">(</span>res<span class="token punctuation">.</span>affectedRows <span class="token operator">==</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'insert success'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre></div><h2 id="update语句"><a href="#update语句" class="header-anchor">#</a> update语句</h2> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> updateSql <span class="token operator">=</span> <span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">Update  new_table set  name=? ,password=? where id=?</span><span class="token template-punctuation string">`</span></span>
<span class="token comment">// const insertSql = `insert into new_table SET ?`</span>
db<span class="token punctuation">.</span><span class="token function">query</span><span class="token punctuation">(</span>updateSql<span class="token punctuation">,</span><span class="token punctuation">[</span>obj<span class="token punctuation">.</span>name<span class="token punctuation">,</span>obj<span class="token punctuation">.</span>password<span class="token punctuation">,</span>obj<span class="token punctuation">.</span>id<span class="token punctuation">]</span><span class="token punctuation">,</span><span class="token punctuation">(</span><span class="token parameter">err<span class="token punctuation">,</span>res</span><span class="token punctuation">)</span><span class="token operator">=&gt;</span><span class="token punctuation">{</span>
    <span class="token keyword">if</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span><span class="token punctuation">{</span>
        console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>err<span class="token punctuation">.</span>message<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
    <span class="token keyword">if</span><span class="token punctuation">(</span>res<span class="token punctuation">.</span>affectedRows <span class="token operator">==</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'insert success'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>

<span class="token comment">//简化写法</span>
<span class="token keyword">const</span> updateSql <span class="token operator">=</span> <span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">Update  new_table set ? where id=?</span><span class="token template-punctuation string">`</span></span>
db<span class="token punctuation">.</span><span class="token function">query</span><span class="token punctuation">(</span>updateSql<span class="token punctuation">,</span><span class="token punctuation">[</span>obj<span class="token punctuation">,</span>obj<span class="token punctuation">.</span>id<span class="token punctuation">]</span><span class="token punctuation">,</span><span class="token punctuation">(</span><span class="token parameter">err<span class="token punctuation">,</span>res</span><span class="token punctuation">)</span><span class="token operator">=&gt;</span><span class="token punctuation">{</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre></div><h2 id="delete语句"><a href="#delete语句" class="header-anchor">#</a> delete语句</h2> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> updateSql <span class="token operator">=</span> <span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">delete from  new_table  where id=?</span><span class="token template-punctuation string">`</span></span>
db<span class="token punctuation">.</span><span class="token function">query</span><span class="token punctuation">(</span>updateSql<span class="token punctuation">,</span><span class="token number">5</span><span class="token punctuation">,</span><span class="token punctuation">(</span><span class="token parameter">err<span class="token punctuation">,</span>res</span><span class="token punctuation">)</span><span class="token operator">=&gt;</span><span class="token punctuation">{</span>
    <span class="token keyword">if</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span><span class="token punctuation">{</span>
        console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>err<span class="token punctuation">.</span>message<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
    <span class="token keyword">if</span><span class="token punctuation">(</span>res<span class="token punctuation">.</span>affectedRows <span class="token operator">==</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'insert success'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>

</code></pre></div></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">上次更新:</span> <span class="time">2023-01-04 10:56:12</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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